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* Esben Nielsen <simlo@phys.au.dk> wrote: > Depends on the configuration options. If you used the same configs > they should be the same but if you activated PREEMPT_RT it should slow > things down due to the overhead of irq-threading and mutexes instead > of spinlocks - although I am surprised the factor is _that_ big! one has to make sure the default debug options are disabled. (DEADLOCK_DETECT, PREEMPT_DEBUG, etc.) But even then there will be considerable overhead. Until recently, the overhead used to be even bigger. Note that hackbench is pretty much the worst-case for PREEMPT_RT: lots of locking and scheduling done and we compare the UP kernel to the SMP kernel in essence. (in fact PREEMPT_RT's locking is currently higher overhead than SMP) Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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